On 17 May 2021 16:49:31 +0100 (BST), Theo
wrote:

snip

Given they often come with a 'film' or cap over the ink outlet / head,
it may be possible but the issue with re-filming is getting it dry
enough to stick (they probably put the film on before filling in the
factory).

Wrap them in cling film?

I had thought of that and may have even tried it in the past but I
think the capillary action between film and the nozzles cause the ink
to come out. ;-(

Cheers, T i m